Paper-making machine



H. BAETZ.

PAPER MAKING MACHINE APPLICATION FILED SEPT. 17, 1921.

Patented Dec. 12, 1922.

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APPLICATION FILED SEPT. 17, 192i.

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UNHTED stares HENRY BAETZ, OF ST. LOUIS, MISSOURI, ASSIGNOR TO SKINNERBROS. MFG. ('30., OF ST. LOUIS, MISSOURI, A. CORPORATION OF MISSOURI.

PAPER-MAKING MACHINE.

Application filed September 17, 1921 Serial No. 501,250.

To all whom. it may concern."

Be it known that I, HENRY BAETZ, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new anduseful Improvements in Paper-Making Machines, of which the following isa specification.

My invention has relation to improvements in paper-making machines, andis particularly directed to the drying rolls of a machine of thecontinuous web type. As is well understood in the art, paper-makingmachines of this type consists in a sieve of endless wire cloth carriedon rollers, onto which the pulp is run and carried to a dandy roll whichdetermines the character of the paper. The web is then passed throughrolls where the water is squeezed out, after which it passes over thedriers which consist of rolls or hollow cylinders heated with steam. Itis in connection with these drying rolls that my invention is utilized,to expedite the drying operation. The invention consists specifically inthe application to the paper web of suitable nozzles for dischargingheated air against the surface of the web so as to assist in thevaporization of the moisture and at the same time maintaining'theatmosphere in the vicinity of the web in a comparative state of dryness.These objects together with other advantages will be better apparentfrom a detailed description of the invention in connection with theaccompanying drawings, in which- Figure 1 is a cross-section through thedrying rolls showing m invention applied thereto; Fig. 2 is adlagrammatic view of the drying rolls'with myinvention installed foroperation in connection therewith; Fig. 3 is an enlarged endviewof threedrying rolls over which the paper web is passed showing the dispositionof the air conduit and nozzles so as to discharge the heated airdiagonally against the web; Fig. 4 is a ver-' tical transverse sectiontaken on the line 44 of Fig. 3; Fig. 5 is a side elevation of the supplypipes and nozzles with part broken away and looking in the direction ofthe arrow (Fig. 3) Fig. 6 is a cross-section through one of the nozzles,taken on the line 6-6 of Fig. 4.

Referring to the drawings, 1 and 1 represent the upper and lower dryingrolls re spectively supported in a skeleton frame F, said rolls havingthe web 2 passed around them. Idler rollers 3 are mounted beneath theupper rolls 1, and a felt web 4 is passed over the idlers 3 and underthe rolls 1, and thence around idlers 3, at the ends of a certain numberof rolls and idlers 3" beneath the idlers 3, the felt web thusconstituting an endless belt. Asthe paper web 2 passes over the rolls1', the felt web 4 likewise passes over said rolls, the paper web 2however being betweenthe rolls and felt web 4. The felt web thus assistsin tween the felt web 4, paper web 2 and upper' roll 1. Because of thepresence of these pockets, the large amount of vapor and steam that isnecessarily formed in the drying of the moist web is more or lessoccluded between the rolls and greatly retards the drying operationnecessitating a greater number of rolls than would be necessary werethis not the case. In order to overcome this disadvantage and therebyobtain the same drying efficiency with a less number of drying rolls Iprovide a branched air conduit 6 arranged beneath each of the upperrolls 1, the branches 6', 6 of each of said conduits being provided witha plu rality (three in the present case) of supply p'ipes 7 7, 7terminating in nozzles 8, 8, 8", he nozzles being located in the pocket5 and extending substantially one-third the width of the web. Of course,there may be any number of supply pipes and nozzles, and the nozzleswill collectively cover the entire width of web. By referring to Fig. 5it will be seen that the nozzles are provided with discharge openings orslots 0, 0, 0 respectively, and these slots extend throughout the entirelength of the nozzle, the first slot being adapted to dischargeheatedair against one-third the width of the web, the next slot taking upwhere the first ends, and the last covering the last third, so that theentire width of the web receives a stream of heated air. The nozzles aredisposed diagonally with relation to the plane of travel of the web, orwhat is the same thing, inclined to the axis of the rolls, and at thesame time curved, the walls of each nozzle being tancf thus disposingand shaping the nozzles ore:

Firstly, by mah'ng the walls of the nozzle II to keep moving in \astraight line and thereby impinge with considerable velocity onthe outerarcuate wall of the nozzle. It is in one of the side walls at itsintersection with this outer wall that the slot is located so that asthe stream of hot air impinges on this outer wall it is immediatelyforced out throughthe slot by the combined forces of its own velocityand inertia. N ow, in addition to being curved, the nozzle tapers downto a smaller size gradually toward the end so that as the air dischargesthrough the slot and the volume is diminished, the pressure will bemaintained so that the stream of air will discharge from the entire slotopening with practically equal force.

Secondly, the diagonal disposition of the discharge slot causes agiven'point in the paper web to travel past the slot on a diagonal, andtherefore remain in the stream of hot air issuing from the slot for alonger period than it said point passed the slot at right angles. Thisis self evident since the diagonal of a rectangle is longer than a side.Therefore all the points in the web that pass I the discharge slot willremain longer in the drying medium than they would if the passed theslot at right angles. Since a the nozzles are inclined or diagonallydisposed, the entire web will secure the benefit of this longer contactwith the stream'of hot air, thus increasing the drying efiect for agiven speed of travel of the web and a given width of discharge slot.

In the present instance the supply pipes 7, 7', 7" are contiguous toeach other, and the first two have a common wall a, and the last 'tWo .acommon wall 5. Valves 9, 9' are mounted in thebranchesb', 6". at theintake end of the supply pipes 7, 7', 7",

7 said valves when entirel open forming a iv tions (shown amount on ancontinuation ofthe partition walls a, b. The

valvesfi '9 may he s to various posi nozzles" can' be controlled so asto direct any part of the web. The conduits 6 receive the heated air V ifrom a header H which is in counication I with the hot air chber C of aheater .10

to which the air supply is conducted by an intake pipe 11.

Y The drying operation is further facili- I tated by providingtransversely disposed dotted Fig. 5) so as to close iofianyone or two ofthe supplylpipes or H tof regulate the amount of air entering them. 'fgInthisiway the air discharging from the inseam side of the lower i orthe air wet a,

Having described my invention, I claim:

1. In a paper-drying machine provided with upper and lower drying rollsbetween and around which the paper web is adapted to travel, a series ofconduits arranged at one side of the rolls, each conduit terminating ina nozzle provided with a discharge opening arranged to discharge adrying medium against the web in a stream adapted to impinge on the webon a diagonal in the plane of said web, and a source of supply for saidconduits.

2. In a paper-drying machine provided with upper and lower drying rollsbetween and around which the to travel, a series of a r conduitsarranged at one side of the rolls, each conduit terminating in a nozzleprovided with an airdischar e slot disposed in parallelism anddiagonadly with relation to the web, and a source of air supply for saidconduits.

3. In a paper-drying machine provided with upper anddower series ofdrying rolls between and around which the paper web is adapted totravel, a series of air conduits arranged at one side ofthe rolls, eachof said conduits terminating in an arcuate nozzle having a dischargeslot in one wall, and a source of air supply for said conduits.

paper web. is adapted j d. In a paper-drying machine provided with upperand lower series of drying rolls between and around which the paper webis adapted to travel, a series of air conduits arranged atone side ofthe rolls, .eachof said conduits terminatin in a plurality of saidnozzles having an air-discharge slot disposed diagonally with relationto the web and adapted to discharge heated air against a portion'ofthewidth of the web, and a source ofair supply for the conduits.

5-. In a -paper-drying machine provided withan upper and a pair of lowerdrying rolls around which the paper web is adapted to travel, therebyforming a pocket between said lower rolls, an 'air conduit disposed atthe end of the rolls, said conduit being provided with a plurality ofdischarge noz? zles located in the pocket, each nozzle being providedwith a discharge slot adapted to discharge heated air diagonally againstthe Web and again t a portion of the width at neeaaii the web, the slotscollectively discharging air against the entire width of web, and asource of air supply for the conduit.

'6. In a paper-drying machine provided with an upper and a pair of lowerdrying "rolls around which the paper web is adapted to travel, therebyforming a pocket between said lower rolls, an air conduit disposed atthe end of the rolls, said conduit being provided with a plurality ofdischarge nozzles, supply pipes connecting said nozzles to conduit, eachof said nozzles being arcuate, and tangential with relation to thesupply pipes, and having a discharge slot in one wall adapted todischarge heated air against the web and over a part of its width thenozzles collectively discharging air over the entire width of web, and asource of air supply for the conduit.

7. In a paper-drying machine provided with upper and lower series ofdrying rolls between and around which the paper web is adapted totravel, a series of air conduits arranged at one side of the rolls, eachof said conduits terminating in a plurality of Valve controlled supplyplpes provided with f position of said stream being perpendicular anddiagonal to the direction of travel of said surface.

In testimony whereof I hereunto afiix my signature.

,l HENRY BAETZ.

